Which of the following is NOT considered a common fishing tool?

The hydraulic jack is not considered a common fishing tool in the context of well drilling and fishing operations. Fishing tools are specifically designed to retrieve or "fish" lost or stuck equipment from the wellbore. Common examples include the overshot, latch jack, and combination socket, which are all specifically engineered for grasping and removing tools or materials that have become lodged in the borehole.

The overshot is a tool used to catch and retrieve objects that are larger than the inner diameter of the casing, while the latch jack is designed to grip and pull parts that have become detached or stuck. The combination socket serves a similar purpose by allowing for the retrieval of various tools through a multi-functional design.

In contrast, a hydraulic jack is typically used for lifting and moving heavy objects rather than for the specific purpose of fishing tools in a wellbore scenario. This distinction is crucial in understanding the appropriate use of equipment in drilling operations.